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Decreased prostasin expression is associated with aggressiveness of oral squamous cell carcinoma

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Abstract

Prostasin is a glycosylphosphatidylinositol-anchored serine protease widely expressed in epithelial cells, with crucial epidermal barrier functions. Evidence has suggested prostasin may have served as a tumor suppressor in various cancers, but its role in oral squamous cell carcinoma (OSCC) remains unclear. Thus, herein, we conducted an immunohistochemical prostasin study in 119 resected OSCC cases. Prostasin expression was decreased in 63% (75/119) of cases. OSCC with decreased prostasin immunoreactivity (low prostasin cases) tended to show a higher histological grade (p = 0.0088) and a more infiltrative cancer cell morphology (p = 0.0024). We then explored the role of prostasin in the OSCC cell lines: SAS and HSC-4. SAS did not express detectable prostasin levels, whereas HSC-4 expressed low but distinct levels. Prostasin overexpression suppressed the proliferation and migration of both OSCC lines in vitro. Conversely, prostasin silencing significantly enhanced growth rates of HSC-4. Finally, we analyzed the impact of prostasin expression on the prognosis of patients with OSCC; decreased expression tended to correlate with shorter overall survival (p = 0.0291) after resection. This trend was supported by our analyses using a public database (Kaplan–Meier plotter) of head and neck squamous cell carcinomas. In conclusion, we showed decreased prostasin expression was associated with aggressive features and a poorer prognosis of OSCC.

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Acknowledgements

We thank Ms. J. Kurogi and A. Nishida for their skilled technical assistance. The authors also thank Enago (www.enago.jp) for English review.

Funding

This work was supported by Japan Society for the Promotion of Science KAKENHI 20K18483 (K.Y.) and 17K08764 (T.F.) and by a Grant for Clinical Research from Miyazaki University Hospital.

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Authors

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KY and FY performed experiments, collected samples, performed analyses, and drafted the manuscript. MK, AI, and TK analyzed data and discussed experimental design and results. HK discussed experimental design. TK and YY collected samples and contributed to patient management. TF designed experiments, discussed experimental design and results, analyzed data, and contributed to the writing of the final manuscript.

Corresponding author

Correspondence to Tsuyoshi Fukushima.

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The authors declare no competing interests.

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The study protocol was performed in accordance with the revised Helsinki Declaration of 2008 and approved by the Institutional Review Board of the Faculty of Medicine, University of Miyazaki (ethics approval number: 2014-006).

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Opt-out consent was applied during this study.

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Yamamoto, K., Yamashita, F., Kawaguchi, M. et al. Decreased prostasin expression is associated with aggressiveness of oral squamous cell carcinoma. Human Cell 34, 1434–1445 (2021). https://doi.org/10.1007/s13577-021-00575-3

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  • DOI: https://doi.org/10.1007/s13577-021-00575-3

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